Video camera with aperture blade
AssigneeSanyo Electric Co., Ltd.
InventorsKenichi Kikuchi, Kazuhiko Sugimoto
Life of this patent
Estimating the term…
Abstract
A video camera (10) includes a photographing device (16). The photographing device (16) generates an image signal corresponding to an optical image irradiated on a light-receiving surface, and a monitor (34) displays a moving image based on a generated image signal. An amount of incident light into the photographing device (16) is controlled by an aperture apparatus (14) having an aperture blade that moves to a direction perpendicular to a light axis. A moving amount of the aperture blade is restricted by a predetermined value, and this defines a minimum value of an F number. When the moving image is displayed on the monitor (34), it is prohibited to set to the minimum value of the F number.
Claims12
(Amended) A video camera that displays a moving image of an object photographed by an image sensor in a real time fashion, and records into a recording medium a still image of said object photographed by said image sensor in a desired timing, comprising:
- an aperture blade for adjusting an amount of an incident light into said image sensor by moving toward a direction perpendicular to a light axis;
- a restricting member for restricting a moving amount of said aperture blade in order to define a minimum F number;
- a prohibiting means for prohibiting a setting of said minimum F number when displaying said moving image;
- and
- an allowing means for allowing a setting of said minimum F number when recording said moving image.
(Amended) A video camera:
- comprising
- an aperture blade for adjusting an amount of an incident light into an image sensor by moving toward a direction perpendicular to a light axis;
- a restricting member for restricting a moving amount of said aperture blade in order to define an opening terminal corresponding to a minimum F number;
- an optimum F number calculating means for calculating an optimum F number that defines an optimum exposure amount when an exposure adjusting instruction is applied;
- an exposure time period specifying means for specifying an exposure time period that defines in cooperation with said optimum exposure amount said minimum F number when said optimum F number is included in a predetermined range;
- an aperture blade moving means for moving said aperture blade to said opening terminal when said optimum F number is included in said predetermined range;
- a cutting-off means for cutting-off an incident light into said image sensor by completely closing said aperture blade in a timing according to said exposure time period when a recording instruction is applied after said exposure time period adjusting instruction;
- and
- a recording means for recoding a still image signal outputted from said image sensor after a cutting-off by said cutting-off means.
(Deleted)
(Deleted)
(Amended) A video camera, comprising:
- an image sensor for generating an image signal corresponding to an optical image irradiated onto a light-receiving surface;
- an aperture blade for adjusting an incident light amount into said image sensor by moving toward a direction perpendicular to a light axis;
- a calculating means for calculating an optimum F number of said aperture blade based on said image signal;
- and
- a changing means for changing the F number of said aperture blade to said optimum F number, wherein
- said changing means gradually changes said F number to only one of a first direction in which a numerical value decreases, and a second direction in which the numerical value increases.
(Deleted)
Dependencies are inferred from the claim text.